Abstract
In this study we focus on a 3D computational model for the description of microperfusion and its application in liver lobes. The remodeling of microperfusion is initiated after a venous outflow obstruction. In particular, focal hepatovenous outflow obstruction can be caused by liver resection. Drainage of the obstructed territories is reestablished via dilatation of sinusoids connecting outflow obstructed territories to territories with normal hepatovenous outflow. Microperfusion is modeled by a homogenized biphasic approach based on the theory of porous media, see Ricken et al. (Biomech. Model. Mechanobiol. 9:435–450, 2010). Regarding the remodeling of microcirculation we make use of the phenomenological hypothesis that the blood pressure gradient is the main driving force for the formation of sinusoidal vascular canals. We recall the constitutive relations for the biphasic model including the solid stress, the transverse isotropic permeability law, and the remodeling algorithm. Finally, we present a numerical three-dimensional example covering microcirculation in seven liver lobes. After calculating the physiological status of the microcirculation in the liver lobes, we tested the hypothesis that the reorientation of blood flow mainly depends on the pressure gradient. Our findings support this hypothesis due to good agreement between experimental observation and computational results. Further investigations are needed to analyze functional processes such as cell metabolism.
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Ricken, T., Dahmen, U., Dirsch, O., Werner, D.Q. (2013). A Biphasic 3D-FEM Model for the Remodeling of Microcirculation in Liver Lobes. In: Holzapfel, G., Kuhl, E. (eds) Computer Models in Biomechanics. Springer, Dordrecht. https://doi.org/10.1007/978-94-007-5464-5_20
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DOI: https://doi.org/10.1007/978-94-007-5464-5_20
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